Galaxy — a spiral arm of stars

Galaxy paints a slowly rotating spiral galaxy. Hundreds of stars orbit the center at differential speeds (inner stars spin faster than outer — Keplerian-ish). Click anywhere to add a star: it joins the rotation and traces an arm over time.

How to play

Click to add a star at that position. Drag to give the whole galaxy a spin push — pull it clockwise or counter. The center has a subtle bulge that brightens with star count.

Why it's satisfying

Spiral galaxies are one of the most universally recognized cosmic shapes. Watching one rotate at a meditative pace, knowing you can sprinkle in your own stars, gives a small godlike calm.

About

Galaxy is part of Alcy, free contemplative micro-games. For more cosmos: Constellation, Orbit, Tunnel.